qcacmn: Validate rx desc unmap in RXDMA err ring

Currently, in STA+Monitor mode, the first MSDU in MPDU is
unmapped and goes down. This MSDU is now processed as rxdma
err packet and crashes due to double unmap as rxdma err ring
is configured as monitor dest ring in monitor mode.
To fix this, validate rx descriptor unmapped flag in rxdma
err processing.

Change-Id: Ic503aa18e2269d8bda6aaf9b349c1ad8be11dcff
CRs-Fixed: 3175972

dp/wifi3.0/dp_rx_err.c

@@ -3236,13 +3236,16 @@ dp_rx_err_mpdu_pop(struct dp_soc *soc, uint32_t mac_id,
 						continue;
 					}
 
-					rx_desc_pool = &soc->
-						rx_desc_buf[rx_desc->pool_id];
-					dp_ipa_rx_buf_smmu_mapping_lock(soc);
-					dp_rx_nbuf_unmap_pool(soc, rx_desc_pool,
-							      msdu);
-					rx_desc->unmapped = 1;
-					dp_ipa_rx_buf_smmu_mapping_unlock(soc);
+					if (rx_desc->unmapped == 0) {
+						rx_desc_pool =
+							&soc->rx_desc_buf[rx_desc->pool_id];
+						dp_ipa_rx_buf_smmu_mapping_lock(soc);
+						dp_rx_nbuf_unmap_pool(soc,
+								      rx_desc_pool,
+								      msdu);
+						rx_desc->unmapped = 1;
+						dp_ipa_rx_buf_smmu_mapping_unlock(soc);
+					}
 
 					dp_rx_err_debug("%pK: msdu_nbuf=%pK ",
 							soc, msdu);